Gas Diffusion Layer, System, and Method for Manufacturing a Gas Diffusion Layer
a technology of gas diffusion layer and gas diffusion layer, which is applied in the direction of sustainable manufacturing/processing, cell components, knitting, etc., can solve the problems of reducing the efficiency of the cell, and significant pressure drop in the cell
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example 1
[0041]A two-layered gas diffusion layer is produced as follows:
[0042]First, the first layer is manufactured in such a way that curled, oxidized polyacrylonitrile fibers are carded and laid to form a web. This web is then swirled and solidified by high-pressure fluid water jets at a pressure of 150 bar. This layer is then dried at 120° C. The first layer is then compressed to a 0.2 mm thickness at a temperature of 320° C. using a calender. The first layer is then carbonized at a temperature of 1400° C. under nitrogen atmosphere. The first layer thus manufactured has a mass per unit area of 65 g / m2.
[0043]The second layer is represented by a carbon fiber paper which is commercially available. This carbon fiber paper is manufactured under the name TGPH 30 by Toray Industries Inc., Japan. The two layers are laid one on top of another and compressed during installation in a fuel cell. The first layer faces toward the diaphragm of a fuel cell.
example 2
[0044]Example 2 represents a gas diffusion layer in which the first layer is manufactured similarly to the first layer from Example 1. The first layer differs solely in its mass per unit area from the layer of Example 1.
[0045]The mass per unit area of the first layer according to Example 2 is 100 g / m2. A coating functions as the second layer. The coating has a mass per unit area of 25 g / m2 and includes 80% carbon black and 20% phenyl resin (type 9282 FP, Bakelite, Germany). The coating is punctual, the points having a diameter which is less than 0.5 mm. The coating causes 27% single-side area coverage of the first layer. The coating is applied to the first layer using screen printing. A paste which includes 20% solid, namely carbon black and phenyl resin, and 80% water is used for the screen printing. After the application of the paste by screen printing, it is dried at a temperature of 120° C., which causes the water component to vaporize. A controlled heating at a temperature of 2...
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